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# An industrial psychologist investigating absenteeism of workers

### Resolved Question:

An industrial psychologist investigating absenteeism of workers at a local plant collects data from a sample of 45 workers. The number of days absent (during the past year) for each worker is recorded and the variance is determined to be 9. What is the standard of deviation?
Submitted: 5 years ago.
Category: Math Homework
Expert:  David replied 5 years ago.

David :

it is given by sqrt(9/45) = 0.45

David :

I've rounded to the 2 decimal places

David :

Customer:

The textbook shows a different answer. it shows 3 as the answer. Are we missing something? The question is exactly from the textbook. Please let me know. Thanks.

David :

OK then you just need the standard deviation for one worker

David :

which is just square root of the variance

David :

stdev = √9 =3

David :

sorry it was not clear from the question what is needed.

David :

hope this makes sense.